Hi Karin. the direct answer is the tube will withstand application of the
rated hv with only a few microamperes of leakage current showing.
The non-destructive test method is use of a high voltage breakdown tester.
They have the means to vary the applied voltage with a current limiting
resistance to prevent a damaging flash over.
The test is done with the tube cold and out of the equipment. A good tube
will withstand rated voltage and a gassy tube will show leakage current with
less than 1500v typically. Withstanding rated voltage would be about 2X
the expected operating voltage or more.
If you decide to just go for broke and apply the full plate voltage you
shouldn't be surprised if there is a big KAPOW event resulting in damaged
components in the amplifier and/or power supply.
73,
Gerald K5GW
In a message dated 12/1/2014 9:03:08 A.M. Pacific Standard Time,
karinann@tampabay.rr.com writes:
What metric does one use to determine if a given tube holds a vacuum or
not?
Cheers,
Karin K3UU
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